CN111947280A - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN111947280A CN111947280A CN202010687736.6A CN202010687736A CN111947280A CN 111947280 A CN111947280 A CN 111947280A CN 202010687736 A CN202010687736 A CN 202010687736A CN 111947280 A CN111947280 A CN 111947280A
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- compressor
- conditioning system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses an air conditioning system and a control method thereof, wherein the air conditioning system comprises: indoor unit and outdoor unit. The indoor unit includes: the indoor heat exchanger, indoor controller and first temperature sensor, first temperature sensor is used for detecting the temperature of indoor heat exchanger. The outdoor unit includes: the indoor controller selectively controls the compressor to stop and controls the fan to stop after delaying the first time according to the detection results of the first temperature sensor and the second temperature sensor. The air conditioning system can solve the problem that the icing of the indoor heat exchanger can not be removed in a low-temperature refrigeration mode.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a control method thereof.
Background
An air conditioner is an air conditioner with multiple functions of refrigeration, heating, dehumidification and the like. The use of the air conditioner also brings great convenience to the life of people.
However, in the related art, when the air conditioner is in the low-temperature refrigeration mode, the heat exchanger of the indoor unit of the air conditioner is frozen, and as the current air conditioner is used in a low-temperature environment more and more, the situation that the liquid refrigerant enters the compressor to damage the compressor cannot be avoided.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an air conditioning system, which can solve the problem that the freezing of the indoor heat exchanger cannot be released and the liquid refrigerant can be prevented from entering the compressor in the low-temperature refrigeration mode.
The invention also provides a control method of the air conditioning system.
The air conditioning system of the present invention includes: an indoor unit, the indoor unit comprising: the indoor heat exchanger comprises an indoor heat exchanger, an indoor controller and a first temperature sensor, wherein the first temperature sensor is used for detecting the temperature of the indoor heat exchanger; an outdoor unit including: the four-way valve, the compressor, the throttling device, the outdoor heat exchanger, the second temperature sensor and the fan are connected to form a refrigerant circulation loop, the second temperature sensor is used for detecting the temperature of the outdoor heat exchanger, the fan is arranged on one side of the outdoor heat exchanger, the first temperature sensor, the second temperature sensor, the compressor and the fan are electrically connected with the indoor controller, and the indoor controller selectively controls the compressor to stop and controls the fan to stop after delaying the first time according to the detection results of the first temperature sensor and the second temperature sensor.
Therefore, the air conditioning system of the invention detects the temperature of the indoor heat exchanger by arranging the first temperature sensor in the indoor unit, detects the temperature of the outdoor heat exchanger by arranging the second temperature sensor in the outdoor unit, and arranges the indoor controller in the indoor unit, therefore, the first temperature sensor and the second temperature sensor can transmit the detected temperature value data to the indoor controller, and the indoor controller can prevent the indoor heat exchanger from the condition that the icing can not be removed even if the air conditioner performs low-temperature refrigeration by controlling the compressor, the fan and the heating element.
According to some embodiments of the invention, the air conditioning system further comprises: the indoor heat exchanger is connected with the four-way valve in parallel, the liquid storage device is provided with a heating element, and the heating element is electrically connected with the indoor controller to selectively control the heating element to work.
According to some embodiments of the invention, the heating member is one of a heating belt, a heating rod and a heating wire, the heating member is sleeved outside the liquid reservoir, or the heating member is disposed in the liquid reservoir.
According to some embodiments of the invention, a first control valve is connected in series to an inlet side of the accumulator, a second control valve and a gas-liquid separator are connected in series to an outlet of the accumulator, the first control valve is an electronic expansion valve, and the second control valve is a one-way valve that allows a flow from the accumulator to the gas-liquid separator.
According to some embodiments of the present invention, a gas-liquid separation hole having an inner diameter of 4 to 6mm is formed in the gas-liquid separator.
The control method of the air conditioning system of the invention comprises the following steps: when the compressor is not operated in the dehumidification mode, the second temperature sensor detects that the temperature of the coil of the outdoor heat exchanger is a first temperature t1 and sends the first temperature t1 to the indoor controller; when the compressor works in a refrigeration or dehumidification mode, the second temperature sensor detects that the temperature of the coil of the outdoor heat exchanger is a second temperature t2 and sends the second temperature t2 to the indoor controller; the first temperature sensor detects that the temperature of the coil of the indoor heat exchanger is a third temperature t3 and sends the third temperature t3 to the indoor controller; when any one of the following conditions is satisfied: 1) the first temperature T1 is less than or equal to a first preset temperature T1, the third temperature T3 is less than or equal to a third preset temperature T3, and the working time S1 of the compressor is less than or equal to a first preset time S1; 2) the second temperature T2 is less than or equal to a second preset temperature T2, and the third temperature T3 is less than or equal to a third preset temperature T3; the indoor controller sends a stop signal, the compressor is stopped, and the fan is stopped after the first time delay.
According to some embodiments of the invention, the air conditioning system satisfies the following conditions: and when the third temperature T3 is greater than or equal to a fourth preset temperature T4, the indoor controller sends a starting signal, and the compressor and the fan are started to work.
According to some embodiments of the invention, the air conditioning system is configured to: first temperature T1 more than or equal to first temperature T1 of predetermineeing, second temperature T2 more than or equal to second temperature T2 of predetermineeing is in refrigeration or dehumidification mode third temperature T3 less than or equal to fifth temperature T5 of predetermineeing and last the second time of predetermineeing, indoor controller sends shutdown signal, the compressor is shut down, after the first time of delay the fan is shut down.
According to some embodiments of the invention, the air conditioning system is configured to: and the third temperature T3 is more than or equal to a sixth preset temperature T6, the indoor controller sends a starting signal, and the compressor and the fan are started to work.
According to some embodiments of the invention, the air conditioning system is configured to: in a cooling mode, the first temperature T1 is less than or equal to a seventh preset temperature T7, the indoor controller sends out a heating signal, and the heating element works; when the following conditions are satisfied: in the cooling mode and the first temperature T1 is greater than the eighth preset temperature T8, the indoor controller sends out a heating stop signal, and the heating stops working.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a system diagram of an air conditioning system in a cooling mode according to an embodiment of the present invention;
FIG. 2 is a perspective view of a gas-liquid separator according to an embodiment of the invention;
FIG. 3 is a flow chart of a control method of an air conditioning system;
fig. 4 is a diagram of the operating conditions of the electric heating belt.
Reference numerals:
an air conditioning system 100;
an indoor heat exchanger 10; an outdoor heat exchanger 11; a four-way valve 12; a compressor 13;
a throttle device 20; a reservoir 21; a heating member 22; a first control valve 23; a second control valve 24;
a gas-liquid separator 25; the gas-liquid separation hole 251.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
An air conditioning system 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 4.
As shown in fig. 1, the air conditioning system 100 includes: indoor set and off-premises station, the indoor set includes: the indoor heat exchanger 10, indoor controller and first temperature sensor, first temperature sensor is used for detecting the temperature of indoor heat exchanger 10. The heat exchanger is a device for transferring partial heat of hot fluid to cold fluid, and is also called as a heat exchanger, when the air conditioner is in a refrigeration mode, the indoor heat exchanger 10 can be used as an evaporator, and the evaporator is used for achieving the refrigeration purpose by utilizing the fact that liquid low-temperature refrigerant is easy to evaporate under low pressure, is converted into steam and absorbs heat of a cooled medium. The first temperature sensor may be disposed adjacent to the indoor heat exchanger 10, or the first temperature sensor may be disposed directly on the indoor heat exchanger 10, which may allow the first temperature sensor to accurately measure the temperature of the indoor heat exchanger 10, so as to transmit the measured temperature data to the indoor controller. Specifically, the first temperature sensor may be used to detect the coil temperature of the indoor heat exchanger 10.
As shown in fig. 1, the outdoor unit includes: the four-way valve 12, the compressor 13, the throttling device 20, the outdoor heat exchanger 11, a second temperature sensor and a fan are connected to form a refrigerant circulation loop, the four-way valve 12, the compressor 13, the outdoor heat exchanger 11, the throttling device 20 and the indoor heat exchanger 10 are connected to form a refrigerant circulation loop, the second temperature sensor is used for detecting the temperature of the outdoor heat exchanger 11, the second temperature sensor can be arranged close to the outdoor heat exchanger 11, or the second temperature sensor can be directly arranged on the outdoor heat exchanger 11, and therefore the second temperature sensor can accurately measure the temperature of the outdoor heat exchanger 11, and the measured temperature data can be conveniently transmitted to an indoor controller. Among them, the outdoor heat exchanger 11 may function as a condenser, and the indoor heat exchanger 10 may function as an evaporator. The fan is disposed at one side of the outdoor heat exchanger 11 and is mainly used for taking away part of heat of the outdoor heat exchanger 11.
The first temperature sensor and the second temperature sensor, the compressor 13 and the fan are all electrically connected with the indoor controller, and the indoor controller selectively controls the compressor 13 to stop and controls the fan to stop after delaying the first time according to the detection results of the first temperature sensor and the second temperature sensor. Therefore, the indoor controller not only controls the corresponding components of the indoor unit, but also simultaneously controls the components such as the second temperature sensor, the compressor 13, the fan and the like, so that the air-conditioning system 100 only needs to be provided with the indoor controller, the outdoor controller can be omitted, and the cost of the air-conditioning system 100 can be further reduced.
On the basis, when the indoor and outdoor temperatures are low, for example, in winter, the indoor controller of the air conditioning system 100 controls the compressor 13 to stop and controls the fan to stop after delaying for the first time through the corresponding detection result, so that the indoor heat exchanger 11 can be prevented from freezing, an anti-freezing effect can be achieved, and the machine can be effectively protected. In addition, the indoor controller and the second temperature sensor are arranged in this way, and an outdoor environment temperature sensor does not need to be arranged, so that the cost of the air conditioning system 100 can be reduced again.
According to the air conditioning system 100 of the embodiment of the invention, the first temperature sensor is arranged in the indoor unit to detect the temperature of the outdoor heat exchanger 11, the second temperature sensor is arranged in the outdoor unit to detect the temperature of the indoor heat exchanger 10, and the indoor controller is arranged in the indoor unit, so that the first temperature sensor and the second temperature sensor can transmit detected data to the indoor controller, and the indoor controller can prevent the indoor heat exchanger 10 from being incapable of removing the icing even if the air conditioner performs low-temperature refrigeration by controlling the compressor 13, the fan and the heating element 22, and can omit the outdoor controller and the ambient temperature sensor, thereby effectively reducing the cost of the air conditioning system 100.
As shown in fig. 1, the air conditioning system 100 further includes: and a reservoir 21 connected in parallel between the indoor heat exchanger 10 and the four-way valve 12, wherein the reservoir 21 is provided with a heating element 22, and the heating element 22 is electrically connected with the indoor controller to selectively control the heating element 22 to work. It can be understood that, when the temperature of the indoor heat exchanger 10 measured by the first temperature sensor is lower than the preset temperature, the first temperature sensor transmits the measured temperature data to the indoor controller, and the indoor controller controls the electric heater to heat the liquid refrigerant in the liquid reservoir 21 to become a gaseous refrigerant, so that more refrigerants can return to the refrigerant circulation loop, and the performance of the air conditioning system 100 can be improved.
In detail, as shown in fig. 1, the heating member 22 is one of a heating belt, a heating rod and a heating wire, the heating member 22 is sleeved outside the liquid reservoir 21, or the heating member 22 is disposed in the liquid reservoir 21. For example, a heating wire may be wound on an outer side surface of the liquid reservoir 21 to generate heat by electrifying the heating wire, so that the heat generated by the heating wire is transferred to the liquid reservoir 21, and the liquid refrigerant in the liquid reservoir 21 may be heated and gasified into a gaseous refrigerant.
In the embodiment of the present invention, as shown in fig. 1 and 2, a first control valve 23 is connected in series to an inlet side of the accumulator 21, a second control valve 24 and a gas-liquid separator 25 are connected in series to an outlet of the accumulator 21, the first control valve 23 is an electronic expansion valve, and the second control valve 24 is a check valve that allows a flow from the accumulator 21 to the gas-liquid separator 25. The electronic expansion valve is used only for a few seconds from the fully closed state to the fully opened state, the reaction and action speed is high, the static superheat phenomenon does not exist, and the opening and closing characteristics and the speed can be set artificially, so that the flow rate and the flow speed of the refrigerant entering the liquid storage device 21 can be controlled through the electronic expansion valve. In addition, the gas-liquid separator 25 can perform a gas-liquid separation function, so that the liquid refrigerant can be prevented from entering the compressor 13, the compressor 13 can be prevented from being impacted by liquid, and the compressor 13 can be effectively protected.
Specifically, as shown in fig. 2, the gas-liquid separator 25 has a gas-liquid separation hole 251 formed therein, and the gas-liquid separation hole 251 has an inner diameter of 4 to 6 mm. It can be understood that, under certain circumstances, the pore diameter of the gas-liquid separation hole 251 is bigger, the classification effect is better, but when the pore diameter is too big, gaseous refrigerant passes through the separation hole very easily, and the gas-liquid separation hole 251 can not play fine gas-liquid separation effect, and when the pore diameter is too small, the liquid film will be formed in the gas-liquid separation hole 251, and liquid refrigerant is difficult to pass through, so can set up the internal diameter of the gas-liquid separation hole 251 to 4-6mm, can make gas-liquid separation's effect better like this.
As shown in fig. 3, the control method of the air conditioning system 100 according to the embodiment of the present invention includes the steps of:
in the dehumidification mode and when the compressor 13 is not operated, the second temperature sensor detects that the coil temperature of the outdoor heat exchanger 11 is the first temperature t1 and sends it to the indoor controller. So that the indoor controller can know the coil temperature of the outdoor heat exchanger 11.
When the compressor 13 is operated in the cooling or dehumidifying mode, the second temperature sensor detects that the temperature of the coil of the outdoor heat exchanger 11 is a second temperature t2, and sends the second temperature t2 to the indoor controller; so that the indoor controller can know the coil temperature of the outdoor heat exchanger 11.
The first temperature sensor detects that the coil temperature of the indoor heat exchanger 10 is the third temperature t3, and sends the third temperature t3 to the indoor controller. So that the indoor controller can know the coil temperature of the indoor heat exchanger 10.
When any one of the following conditions is satisfied:
the first temperature T1 is less than or equal to a first preset temperature T1, the third temperature T3 is less than or equal to a third preset temperature T3, and the working time S1 of the compressor 13 is less than or equal to a first preset time S1; wherein T1 may satisfy the relationship: t1 is more than or equal to 15 ℃ and less than or equal to 20 ℃, and T3 can satisfy the relation: t3 is more than or equal to 3 ℃ and less than or equal to 5 ℃, and S1 can satisfy the relation: 0.1h ≦ S1 ≦ 0.8h, for example S1 may be 0.5 h.
2) The second temperature T2 is less than or equal to the second preset temperature T2, and the third temperature T3 is less than or equal to the third preset temperature T3, wherein T2 may satisfy the relation: t2 is more than or equal to 14 ℃ and less than or equal to 16 ℃.
The indoor controller sends a stop signal, the compressor 13 is stopped, and the fan is stopped after the first time delay.
It can be understood that after the indoor controller knows the coil temperature of the outdoor heat exchanger 11 and the coil temperature of the indoor heat exchanger 10, corresponding analysis can be performed according to the detection result, when the indoor controller meets any one of the above conditions, the indoor controller can determine that the indoor heat exchanger 10 has a risk of freezing, based on which, the indoor controller controls the compressor to stop working, so that the indoor heat exchanger 10 can also suspend indoor heat exchange, thereby avoiding the phenomenon that the indoor heat exchanger 10 freezes, and effectively protecting the indoor unit. It should be noted that, the fan is turned off after the first time is delayed, so that heat exchange at the outdoor heat exchanger 11 is further facilitated, and preparation can be made for next startup. The first time may be set according to actual circumstances, and may be, for example, 30s, 1min, or 3 min.
Alternatively, as shown in fig. 3, when the following condition is satisfied: when the third temperature T3 is greater than or equal to the fourth preset temperature T4, the indoor controller sends a start-up signal, and the compressor 13 and the fan start up to work. That is to say, when the above conditions are met, the indoor controller can determine that the indoor heat exchanger 10 has not been frozen, and then can control the compressor 13 and the fan to restart again, so that the refrigeration process can be continued, and the indoor heat exchanger 10 can be effectively protected on the premise of meeting the use requirements of users. Wherein the range of T4 satisfies: t4 is more than or equal to 7 ℃ and less than or equal to 10 ℃.
According to a specific embodiment of the present invention, when the following conditions are satisfied: the first temperature T1 is greater than or equal to a first preset temperature T1, the second temperature T2 is greater than or equal to a second preset temperature T2, the third temperature T3 is less than or equal to a fifth preset temperature T5 in the refrigeration or dehumidification mode and lasts for a second preset time S2, the indoor controller sends a stop signal, the compressor 13 stops, and the fan stops after the first time is delayed. That is, the indoor controller may control the compressor 13 to be stopped not only in the above-described two conditions, but also in the same manner in the condition. By adding different conditions, the working conditions of the compressor 13 and the fan can be more effectively limited, and the phenomenon that the indoor heat exchanger 10 freezes can be better avoided. Wherein the range of T5 satisfies: t5 is more than or equal to 3 ℃ and less than or equal to 5 ℃, and the range of S1 satisfies the following conditions: 10S ≦ S1 ≦ 50hs, for example, S2 may be 30S.
Further, when the following conditions are satisfied: when the third temperature T3 is higher than or equal to the sixth preset temperature T6, the indoor controller sends a start-up signal, and the compressor 13 and the fan start up to work. That is to say, when the above conditions are met, the indoor controller can determine that the indoor heat exchanger 10 has not been frozen, and then can control the compressor 13 and the fan to restart again, so that the refrigeration process can be continued, and the indoor heat exchanger 10 can be effectively protected on the premise of meeting the use requirements of users. Wherein the range of T6 satisfies: t6 is more than or equal to 7 ℃ and less than or equal to 10 ℃.
According to another embodiment of the invention, when the following conditions are satisfied: in the cooling mode, when the first temperature T1 is less than or equal to the seventh preset temperature T7, the indoor controller sends a heating signal, and the heating element 22 operates. When the following conditions are satisfied: in the cooling mode, the first temperature T1 is greater than the eighth preset temperature T8, the indoor controller sends a heating stop signal, and the heating stops working. That is, under the corresponding conditions, the indoor controller may further control the heating element 22 to operate, so that a portion of the liquid refrigerant in the liquid reservoir 21 is converted into a gaseous refrigerant, and the refrigerant circulation amount in the refrigerant circulation loop may be increased. Specifically, as shown in fig. 4, the heating element 22 is an electric heating tape, and when the coil temperature of the indoor heat exchanger 10 is between 15 ℃ and 20 ℃, it can operate correspondingly according to the coil temperature of the outdoor heat exchanger 11. Wherein T7 may satisfy the relationship: t7 is more than or equal to 15 ℃ and less than or equal to 20 ℃, and T8 can satisfy the relation: t8 is more than or equal to 14 ℃ and less than or equal to 16 ℃.
Therefore, through the steps, the compressor 13 and the fan can be turned on and off after comparing the temperature measured by the indoor heat exchanger 10 and the temperature measured by the outdoor heat exchanger 11 according to the preset temperature and the first temperature sensor, so that the liquid refrigerant can be prevented from entering the compressor 13. In addition, the liquid refrigerant in the accumulator 21 can be heated and vaporized into the gaseous refrigerant by providing the heater 22 on the accumulator 21. And then enters the compressor 13 from the gas-liquid separation hole through the gas-liquid separator 25.
Through the control steps of the air conditioning system, the ice formed on the coil of the indoor heat exchanger 10 in a low-temperature state for a long time can be quickly melted. The impact of the liquid refrigerant on the compressor 13 can be avoided, so that the air conditioning system 100 is more optimized.
It should be noted that the preset time and the preset temperature can be set according to actual production conditions and test results.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An air conditioning system, comprising:
an indoor unit, the indoor unit comprising: the indoor heat exchanger comprises an indoor heat exchanger, an indoor controller and a first temperature sensor, wherein the first temperature sensor is used for detecting the temperature of the indoor heat exchanger;
an outdoor unit including: the four-way valve, the compressor, the throttling device, the outdoor heat exchanger, the second temperature sensor and the fan are connected to form a refrigerant circulation loop, the second temperature sensor is used for detecting the temperature of the outdoor heat exchanger, the fan is arranged on one side of the outdoor heat exchanger, the first temperature sensor, the second temperature sensor, the compressor and the fan are electrically connected with the indoor controller, and the indoor controller selectively controls the compressor to stop and controls the fan to stop after delaying the first time according to the detection results of the first temperature sensor and the second temperature sensor.
2. The air conditioning system of claim 1, further comprising: the indoor heat exchanger is connected with the four-way valve in parallel, the liquid storage device is provided with a heating element, and the heating element is electrically connected with the indoor controller to selectively control the heating element to work.
3. The air conditioning system of claim 2, wherein the heating element is one of a heating belt, a heating rod and a heating wire, and the heating element is sleeved outside the reservoir or is disposed in the reservoir.
4. The air conditioning system as claimed in claim 2, wherein a first control valve is connected in series to an inlet side of the accumulator, a second control valve and a gas-liquid separator are connected in series to an outlet of the accumulator, the first control valve is an electronic expansion valve, and the second control valve is a check valve allowing a flow from the accumulator to the gas-liquid separator.
5. The air conditioning system as claimed in claim 4, wherein a gas-liquid separation hole is formed in the gas-liquid separator, and an inner diameter of the gas-liquid separation hole is 4-6 mm.
6. A control method of an air conditioning system according to any one of claims 1 to 5, characterized by comprising the steps of:
when the compressor is not operated in the dehumidification mode, the second temperature sensor detects that the temperature of the coil of the outdoor heat exchanger is a first temperature t1 and sends the first temperature t1 to the indoor controller;
when the compressor works in a refrigeration or dehumidification mode, the second temperature sensor detects that the temperature of the coil of the outdoor heat exchanger is a second temperature t2 and sends the second temperature t2 to the indoor controller;
the first temperature sensor detects that the temperature of the coil of the indoor heat exchanger is a third temperature t3 and sends the third temperature t3 to the indoor controller;
when any one of the following conditions is satisfied:
1) the first temperature T1 is less than or equal to a first preset temperature T1, the third temperature T3 is less than or equal to a third preset temperature T3, and the working time S1 of the compressor is less than or equal to a first preset time S1;
2) the second temperature T2 is less than or equal to a second preset temperature T2, and the third temperature T3 is less than or equal to a third preset temperature T3;
the indoor controller sends a stop signal, the compressor is stopped, and the fan is stopped after the first time delay.
7. The control method of an air conditioning system according to claim 6, characterized in that when the following condition is satisfied: and when the third temperature T3 is greater than or equal to a fourth preset temperature T4, the indoor controller sends a starting signal, and the compressor and the fan are started to work.
8. The control method of an air conditioning system according to claim 6, characterized in that when the following condition is satisfied: first temperature T1 more than or equal to first temperature T1 of predetermineeing, second temperature T2 more than or equal to second temperature T2 of predetermineeing is in refrigeration or dehumidification mode third temperature T3 less than or equal to fifth temperature T5 of predetermineeing and last the second time of predetermineeing, indoor controller sends shutdown signal, the compressor is shut down, after the first time of delay the fan is shut down.
9. The control method of an air conditioning system according to claim 8, characterized in that when the following condition is satisfied: and the third temperature T3 is more than or equal to a sixth preset temperature T6, the indoor controller sends a starting signal, and the compressor and the fan are started to work.
10. The control method of an air conditioning system according to claim 6, characterized in that when the following condition is satisfied: in a cooling mode, the first temperature T1 is less than or equal to a seventh preset temperature T7, the indoor controller sends out a heating signal, and the heating element works;
when the following conditions are satisfied: in the cooling mode and the first temperature T1 is greater than the eighth preset temperature T8, the indoor controller sends out a heating stop signal, and the heating stops working.
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